Java tutorial
/** * <a href="http://www.openolat.org"> * OpenOLAT - Online Learning and Training</a><br> * <p> * Licensed under the Apache License, Version 2.0 (the "License"); <br> * you may not use this file except in compliance with the License.<br> * You may obtain a copy of the License at the * <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache homepage</a> * <p> * Unless required by applicable law or agreed to in writing,<br> * software distributed under the License is distributed on an "AS IS" BASIS, <br> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. <br> * See the License for the specific language governing permissions and <br> * limitations under the License. * <p> * Initial code contributed and copyrighted by<br> * frentix GmbH, http://www.frentix.com * <p> */ package org.olat.core.util.pdf; import java.io.IOException; import java.util.ArrayList; import java.util.Calendar; import java.util.Date; import java.util.List; import java.util.Locale; import javax.xml.transform.TransformerException; import org.apache.jempbox.xmp.XMPMetadata; import org.apache.jempbox.xmp.XMPSchemaBasic; import org.apache.jempbox.xmp.XMPSchemaDublinCore; import org.apache.jempbox.xmp.XMPSchemaPDF; import org.apache.pdfbox.pdmodel.PDDocument; import org.apache.pdfbox.pdmodel.PDDocumentCatalog; import org.apache.pdfbox.pdmodel.PDDocumentInformation; import org.apache.pdfbox.pdmodel.PDPage; import org.apache.pdfbox.pdmodel.common.PDMetadata; import org.apache.pdfbox.pdmodel.common.PDRectangle; import org.apache.pdfbox.pdmodel.edit.PDPageContentStream; import org.apache.pdfbox.pdmodel.font.PDFont; import org.apache.pdfbox.pdmodel.font.PDType1Font; import org.olat.core.util.Formatter; import org.olat.core.util.StringHelper; /** * The metric is dpi: 72 dpi.<br/> * 1 inch -> 72 points<br/> * 1cm -> 28.3 points<br/> * * Initial date: 12.02.2014<br> * @author srosse, stephane.rosse@frentix.com, http://www.frentix.com * */ public class PdfDocument { protected PDFont font = PDType1Font.HELVETICA; protected PDFont fontBold = PDType1Font.HELVETICA_BOLD; protected float marginTopBottom = 72.0f; protected float marginLeftRight = 72.0f; protected float lineHeightFactory = 1.5f; protected float width; protected PDDocument document; protected PDPage currentPage; protected PDPageContentStream currentContentStream; protected float currentY; private String printDate; public PdfDocument(Locale locale) throws IOException { document = new PDDocument(); printDate = Formatter.getInstance(locale).formatDate(new Date()); } public void close() throws IOException { document.close(); } public PDPage addPage() throws IOException { if (currentContentStream != null) { currentContentStream.close(); } PDPage page = new PDPage(PDPage.PAGE_SIZE_A4); document.addPage(page); currentPage = page; currentContentStream = new PDPageContentStream(document, currentPage); PDRectangle mediabox = currentPage.findMediaBox(); width = mediabox.getWidth() - 2 * marginLeftRight; currentY = mediabox.getUpperRightY() - marginTopBottom; return page; } public void closePage() throws IOException { if (currentContentStream != null) { currentContentStream.close(); } } public void addText(String text, float fontSize) throws IOException { currentContentStream.beginText(); currentContentStream.setFont(font, fontSize); currentContentStream.moveTextPositionByAmount(marginLeftRight, currentY); currentContentStream.drawString(text); currentContentStream.endText(); float leading = lineHeightFactory * fontSize; currentY -= leading; } public void addParagraph(String text, float fontSize, float width) throws IOException { addParagraph(text, fontSize, false, width); } public void addParagraph(String text, float fontSize, boolean bold, float width) throws IOException { float leading = lineHeightFactory * fontSize; PDFont textFont = bold ? fontBold : font; List<String> lines = new ArrayList<String>(); int lastSpace = -1; while (text.length() > 0) { int spaceIndex = text.indexOf(' ', lastSpace + 1); if (spaceIndex < 0) { lines.add(text); text = ""; } else { String subString = text.substring(0, spaceIndex); float size = fontSize * textFont.getStringWidth(subString) / 1000; if (size > width) { if (lastSpace < 0) // So we have a word longer than the line... draw it anyways lastSpace = spaceIndex; subString = text.substring(0, lastSpace); lines.add(subString); text = text.substring(lastSpace).trim(); lastSpace = -1; } else { lastSpace = spaceIndex; } } } currentContentStream.beginText(); currentContentStream.setFont(textFont, fontSize); currentContentStream.moveTextPositionByAmount(marginLeftRight, currentY); for (String line : lines) { currentContentStream.drawString(line); currentContentStream.moveTextPositionByAmount(0, -leading); currentY -= leading; } currentContentStream.endText(); } public float getStringWidth(String string, float fontSize) throws IOException { return fontSize * font.getStringWidth(string) / 1000; } public void drawLine(float xStart, float yStart, float xEnd, float yEnd, float width) throws IOException { currentContentStream.setLineWidth(width); currentContentStream.drawLine(xStart, yStart, xEnd, yEnd); } public void drawTextAtMovedPositionByAmount(String text, float fontSize, float textx, float texty) throws IOException { if (!StringHelper.containsNonWhitespace(text)) return; currentContentStream.beginText(); currentContentStream.setFont(font, fontSize); currentContentStream.moveTextPositionByAmount(textx, texty); currentContentStream.drawString(text); currentContentStream.endText(); } public void addMetadata(String title, String subject, String author) throws IOException, TransformerException { PDDocumentCatalog catalog = document.getDocumentCatalog(); PDDocumentInformation info = document.getDocumentInformation(); Calendar date = Calendar.getInstance(); info.setAuthor(author); info.setCreator(author); info.setCreationDate(date); info.setModificationDate(date); info.setTitle(title); info.setSubject(subject); XMPMetadata metadata = new XMPMetadata(); XMPSchemaPDF pdfSchema = metadata.addPDFSchema(); pdfSchema.setProducer("OpenOLAT"); XMPSchemaBasic basicSchema = metadata.addBasicSchema(); basicSchema.setModifyDate(date); basicSchema.setCreateDate(date); basicSchema.setCreatorTool("OpenOLAT"); basicSchema.setMetadataDate(date); XMPSchemaDublinCore dcSchema = metadata.addDublinCoreSchema(); dcSchema.setTitle(title); dcSchema.addCreator(author); dcSchema.setDescription(subject); PDMetadata metadataStream = new PDMetadata(document); metadataStream.importXMPMetadata(metadata); catalog.setMetadata(metadataStream); } public void addPageNumbers() throws IOException { float footerFontSize = 10.0f; @SuppressWarnings("unchecked") List<PDPage> allPages = document.getDocumentCatalog().getAllPages(); int numOfPages = allPages.size(); for (int i = 0; i < allPages.size(); i++) { PDPage page = allPages.get(i); PDRectangle pageSize = page.findMediaBox(); String text = (i + 1) + " / " + numOfPages; float stringWidth = getStringWidth(text, footerFontSize); // calculate to center of the page float pageWidth = pageSize.getWidth(); double x = (pageWidth - stringWidth) / 2.0f; double y = (marginTopBottom / 2.0f); // append the content to the existing stream PDPageContentStream contentStream = new PDPageContentStream(document, page, true, true, true); contentStream.beginText(); // set font and font size contentStream.setFont(font, footerFontSize); contentStream.setTextTranslation(x, y); contentStream.drawString(text); contentStream.endText(); //set current date contentStream.beginText(); contentStream.setFont(font, footerFontSize); contentStream.setTextTranslation(marginLeftRight, y); contentStream.drawString(printDate); contentStream.endText(); contentStream.close(); } } }